"Mel B is spearheading the crusade for the band to do a reunion tour as they had a total blast performing at the Closing Ceremony. Geri Halliwell, Mel C and Emma Bunton are all on board, but, of course, the lone holdout is Victoria," a source close to the band tells Radar. "Vicky says she just has way too much on her plate right now with her fashion label and so busy being a mother to four young children, and wife to David and it just doesn't seem like she wants any part of a reunion tour."

The Spice Girls understand Victoria's situation, however, they want to strike while they're popular again and will hit the road without her.

"Mel B is the mama bear and de facto leader of the Spice Girls and it's no secret that she and Vicky have had their differences over the years," the source says. "However, Mel has been extremely diplomatic and sincere when talking to Vicky about doing the reunion tour and is hopeful that she will relent and agree to do it. Mel B is very persuasive and always gets what she wants and she has appealed to the fact that Vicky now has a daughter. Mel told Vicky it's time to show little Harper what girl power is really all about!"

The 38-year-old is incredibly reluctant though, and almost didn't perform at the Summer Games, so a reunion tour seems unlikely for her.

"Victoria obviously recognized that if she didn't join the band for the closing ceremony it would look really bad. Victoria is very grateful for the platform the band has given her, but she just likes to create distance from that time in her life because she wants to be taken seriously as a fashion designer. Ultimately though, the band came together and did a hell of a job in their performance. Victoria was gushing afterwards that she was so glad she had decided to do it," the insider previously said.

Would you see the Spice Girls on tour if Victoria wasn't performing with them?